Removed SfxItemSet_Pointer_t and SfxStyleSheetIteratorPtr

Change-Id: Ibfa6a79809fdbbe2648dacc02625e620ceaf9bf0
Reviewed-on: https://gerrit.libreoffice.org/25851Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>